Air contracts as it cools, and a tyre is a sealed container of it. A pressure that was correct at four in the afternoon can be a tenth of a bar lower by four in the morning without a single molecule having escaped, purely because the air inside has dropped ten degrees along with the street outside. That is why pressure warning lights have a season and an hour. They appear far more often on the first cold nights of autumn than at any other time of year, and they appear when you start the car rather than when you park it.
None of which means the light is wrong. A tyre at the correct pressure has enough margin to survive a cold night without triggering anything. A tyre that was already a little down, because it has a screw in it that nobody has found, spends the cold hours crossing the line. The temperature did not cause that. It revealed it, and it will go on revealing it every morning until somebody actually looks at the tyre. So if the light comes up at five before an early start, it is worth a proper look rather than a squirt of air and a hopeful drive. We work nights every night of the year and the phone is answered at that hour.
Christmas Day, New Year, Easter Monday: the days when absolutely nothing is open are the days a tyre picks. It runs 365 days a year across Greater London, bank holidays included, at whatever hour the call comes in. A the Charles Square area cul-de-sac or a Whitmore Estate main road, tell us which. A tight terrace in Whitmore Estate or a narrow bay on Old Street is usually workable. N1 takes in Pitfield Street and Kingsland Road, and we work the lot.
24-hour tyre callout in Hoxton is part of our wider 24-hour emergency callout cover. For 24-hour tyre callout in Hoxton, call 07717 389637 or ask us for a quote.
Almost nothing round here sleeps in a garage. Cars sit out all night on the permit streets off Pitfield Street and in estate bays, so they take the full temperature drop, and every one of them reads lower in the morning than it did the evening before. That is normal and it is not the problem. The problem is that a genuine slow puncture hides inside it perfectly well, one cold morning at a time, until it stops being slow. If a light keeps coming back after a top up, the weather has stopped being the explanation.
The pressure had gone under overnight and the driver had a shift to get to. It turned out to be a nail that had been sitting in the tread for a fortnight and had been topped up twice without anybody looking properly at it.
A car that read fine every afternoon and lit the dashboard on every cold morning for a week. The owner had assumed it was the weather, which it partly was. The rest of it was a valve seal letting go slowly.
Air at eleven at night and the warning light again by six. Anything that returns that quickly is losing air rather than losing temperature, and it is not something worth chasing round with a compressor twice a week.
Partly, probably. A cold night pulls the pressure down in every tyre on the car, so if all four read a little low and none is dropping further, the weather explains it. If one is well below the other three, the weather has simply shown you which one has the problem.
You can, and it will get you to work. What it will not do is tell you why the pressure went down, and a tyre needing air more often than about once a month has something in it. If the light returns within a day or two, that is your answer arriving.
It depends on the system. Some cars have a sensor in each wheel and will name the corner and give you a pressure. Others work by comparing how fast the wheels are turning and can only say that something is off. Either way, the light is worth believing.
It is one of our busier hours. Early starts and shift finishes are where a good deal of night work comes from, and a job at that hour gets the same lighting and the same time spent on it as one at midday. Typical arrival across N1 is 30 to 60 minutes.
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